LEAPS-MPS: Tailoring the Thermal Properties of Flexible Two-Dimensional (2D) Heterostructures

该奖项全部或部分根据2021年美国救援计划法案（公法117-2）资助。非技术性描述。最近的进展，原子级薄的晶体衍生自层状材料，使二维（2D）异质结构的创建具有独特的性能。这些异质结构具有多种应用，包括可穿戴设备、微电子冷却和从废热（热电）发电。基于2D材料的柔性电子产品面临的一个挑战是在保持性能的同时管理机械应力下的热量。进一步的创新需要有效的热控制策略来解决这个问题。这个项目的目标是研究二维异质结构中热输运的基本方面，并通过结构剪裁实现有效的热控制。这项研究推进了当前二维材料和器件的前沿。这项研究有望阐明基本的热物理学，并通过利用2D材料和结构的独特热特性为未来电子学的探索开辟新的途径。这项工作通过实现电子设备的创新设计解决方案来应对全球可持续能源解决方案的巨大挑战。该项目将利用热技术作为一种激励因素，通过关于热传输的波浪性质的互动游戏、将艺术和工程联系起来的讲习班和课程以及为女学生提供辅导，吸引学生参与。PI将与广泛的学生合作，从K-12到研究生，与发育迟缓的学生和那些在STEM中代表性不足的学生合作。该项目将产生非凡的材料，并通过教育活动激励学生。技术说明。本计画的研究目标是借由结构剪裁来研究与控制二维异质结构的基本热行为。了解结构对热性能的影响将被利用来导出基于学习的框架，并直接通过实验进行验证。材料合成，器件纳米加工和热特性的实验方法强调和加强分析建模和计算机模拟。具体地说，在同一侧的双激光光热拉曼技术将被用来执行方向相关和各向异性的热特性上的结构定制的二维异质结构。拟议的研究活动旨在研究新的热物理和开发新的器件技术前体，提供了如何通过结构剪裁控制二维材料热行为的第一手，深入了解，并为开发具有超高效性能的创新二维异质结构器件提供了途径。该项目的成果预计将是对结构-热耦合的基本理解的重大飞跃，实现前所未有的热控制方法，并彻底改变未来的电子平台。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

This award is funded in whole or in part under the American Rescue Plan Act of 2021 (Public Law 117-2). NONTECHNICAL DESCRIPTION. Recent advances in atomically thin crystals derived from layered materials have enabled the creation of two-dimensional (2D) heterostructures with unique properties. These heterostructures have a variety of applications, including wearable devices, microelectronics cooling, and generation of electricity from waste heat (thermoelectricity). One challenge for flexible electronics based on 2D materials is managing heat under mechanical stress while maintaining performance. Further innovations require an efficient thermal control strategy to address this issue. The objective of this project is to examine the fundamental aspects of thermal transport in 2D heterostructures and achieve efficient thermal control via structural tailoring. This research advances the current frontiers of two-dimensional materials and devices. This study is expected to elucidate the essential thermal physics and open a new route for the exploration of future electronics by leveraging unique thermal properties of 2D materials and structures. This work addresses the grand challenge of global sustainable energy solutions by enabling innovative design solutions of electronic devices. The project will use thermal technology as a motivator to engage students via interactive games about the wave nature of thermal transport, workshops and curriculum crosslinking art and engineering, and mentorships for women students. The PI will work with a broad range of students, from K-12 to graduate students, with students with developmental delays and those underrepresented in STEM. This project will generate extraordinary materials and inspire students through educational activities. TECHNICAL DESCRIPTION. The research objective of this project is to investigate and control the fundamental thermal behavior in two-dimensional heterostructures via structural tailoring. Understanding structural effects on thermal properties will be harnessed to derive a learning-based framework and directly validated by experiments. Experimental approaches of materials synthesis, device nanofabrication and thermal characterization are emphasized and reinforced by analytical modeling and computer simulations. Specifically, a dual laser at same side opto-thermal Raman technique will be used to perform direction-dependent and anisotropic thermal characterizations on structurally tailored two-dimensional heterostructures. The proposed research activities, aiming at investigating new thermal physics and developing novel device technological precursors, provide a firsthand, in-depth understanding of how to control thermal behavior of two-dimensional materials via structural tailoring and provide a pathway to the development of innovative two-dimensional heterostructure devices with ultra-efficient performance. The outcome of this project is expected to be a major leap in fundamental understanding of structure-thermal couplings, enabling unprecedented thermal control methods, and revolutionize future electronic platforms.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.